Iranian Biology Society Journal of Plant Research (Iranian Journal of Biology) 2383-2592 31 2 2018 08 23 Floristic studies,life forms and chorotype of plants in the transitional zone of Irano-Turanian and Sahara-Sindian phytochoria in Sistan and Baluchestan Province. Iran Floristic studies,life forms and chorotype of plants in the transitional zone of Irano-Turanian and Sahara-Sindian phytochoria in Sistan and Baluchestan Province. Iran 436 452 1143 FA Soheila Noori Fatemeh Fadaee Assistant Professor, Research Division of Natural Resources, Golestan Agricultural and Natural Resources Research Journal Article 2015 12 27 Floristic studies of any regions have high importance, because the florists list is an exploration document to identify the existing species and consequently the potential of the area. The aim of the study was introducing the flora of the transitional zone of Irano-Turanian and Sahara-Sindian phytochoria in Sistan and Baluchestan Province. For a floristic study of the area plant specimens were collected and identified.Field data collections were conducted during the year 2013. The life forms as well as geographical distributions of the species were determined. Flora in this region include 51 families, 233 genera and 327 species. The larger families are Compositae (42 species), Poaceae (39 species), Brassicaceae (28 species), Papilionaceae (27 species) and Chenopodiaceae (25 species) respectivly. The biggest genus was Astragalus with 7 species. Biological types of this area included Therophytes (37.92%) where the dominant life-form followed by hemicryptophytes (22.94%). phanerophytes (18.96%), Chamaephytes (14.37%) and Geophytes (5.81%). Chrological analysis showed 24.77% of the studied plant species belonged to Irano-Turanian / Sahara-Sindian region and 24.16% Sahara-Sindian, 22.33% Irano-Turanian, 3.36% cosmopolitan elements and others are ploriregional. According to the results of this study, it can be concluded that the research area is located in Ecoton region. Floristic studies of any regions have high importance, because the florists list is an exploration document to identify the existing species and consequently the potential of the area. The aim of the study was introducing the flora of the transitional zone of Irano-Turanian and Sahara-Sindian phytochoria in Sistan and Baluchestan Province. For a floristic study of the area plant specimens were collected and identified.Field data collections were conducted during the year 2013. The life forms as well as geographical distributions of the species were determined. Flora in this region include 51 families, 233 genera and 327 species. The larger families are Compositae (42 species), Poaceae (39 species), Brassicaceae (28 species), Papilionaceae (27 species) and Chenopodiaceae (25 species) respectivly. The biggest genus was Astragalus with 7 species. Biological types of this area included Therophytes (37.92%) where the dominant life-form followed by hemicryptophytes (22.94%). phanerophytes (18.96%), Chamaephytes (14.37%) and Geophytes (5.81%). Chrological analysis showed 24.77% of the studied plant species belonged to Irano-Turanian / Sahara-Sindian region and 24.16% Sahara-Sindian, 22.33% Irano-Turanian, 3.36% cosmopolitan elements and others are ploriregional. According to the results of this study, it can be concluded that the research area is located in Ecoton region. https://plant.ijbio.ir/article_1143_208e43f0e45c4c78cafadb83d2888cb6.pdf